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<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_comment"> * Copyright 2012 The Netty Project</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> * The Netty Project licenses this file to you under the Apache License,</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <em class="jxr_comment"> * version 2.0 (the "License"); you may not use this file except in compliance</em>
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_comment"> * with the License. You may obtain a copy of the License at:</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_comment"> *   <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_comment"> * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_comment"> * License for the specific language governing permissions and limitations</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_comment"> * under the License.</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="16" href="#16">16</a>  <strong class="jxr_keyword">package</strong> org.jboss.netty.util;
<a class="jxr_linenumber" name="17" href="#17">17</a>  
<a class="jxr_linenumber" name="18" href="#18">18</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.channel.ChannelPipelineFactory;
<a class="jxr_linenumber" name="19" href="#19">19</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.logging.InternalLogger;
<a class="jxr_linenumber" name="20" href="#20">20</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.logging.InternalLoggerFactory;
<a class="jxr_linenumber" name="21" href="#21">21</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.util.internal.ConcurrentIdentityHashMap;
<a class="jxr_linenumber" name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.util.internal.DetectionUtil;
<a class="jxr_linenumber" name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.util.internal.ReusableIterator;
<a class="jxr_linenumber" name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> org.jboss.netty.util.internal.SharedResourceMisuseDetector;
<a class="jxr_linenumber" name="25" href="#25">25</a>  
<a class="jxr_linenumber" name="26" href="#26">26</a>  <strong class="jxr_keyword">import</strong> java.util.ArrayList;
<a class="jxr_linenumber" name="27" href="#27">27</a>  <strong class="jxr_keyword">import</strong> java.util.Collections;
<a class="jxr_linenumber" name="28" href="#28">28</a>  <strong class="jxr_keyword">import</strong> java.util.HashSet;
<a class="jxr_linenumber" name="29" href="#29">29</a>  <strong class="jxr_keyword">import</strong> java.util.List;
<a class="jxr_linenumber" name="30" href="#30">30</a>  <strong class="jxr_keyword">import</strong> java.util.Set;
<a class="jxr_linenumber" name="31" href="#31">31</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.Executors;
<a class="jxr_linenumber" name="32" href="#32">32</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.ThreadFactory;
<a class="jxr_linenumber" name="33" href="#33">33</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.TimeUnit;
<a class="jxr_linenumber" name="34" href="#34">34</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.atomic.AtomicInteger;
<a class="jxr_linenumber" name="35" href="#35">35</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.locks.ReadWriteLock;
<a class="jxr_linenumber" name="36" href="#36">36</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.locks.ReentrantReadWriteLock;
<a class="jxr_linenumber" name="37" href="#37">37</a>  
<a class="jxr_linenumber" name="38" href="#38">38</a>  <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="39" href="#39">39</a>  <em class="jxr_javadoccomment"> * A {@link Timer} optimized for approximated I/O timeout scheduling.</em>
<a class="jxr_linenumber" name="40" href="#40">40</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="41" href="#41">41</a>  <em class="jxr_javadoccomment"> * &lt;h3&gt;Tick Duration&lt;/h3&gt;</em>
<a class="jxr_linenumber" name="42" href="#42">42</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="43" href="#43">43</a>  <em class="jxr_javadoccomment"> * As described with 'approximated', this timer does not execute the scheduled</em>
<a class="jxr_linenumber" name="44" href="#44">44</a>  <em class="jxr_javadoccomment"> * {@link TimerTask} on time.  {@link HashedWheelTimer}, on every tick, will</em>
<a class="jxr_linenumber" name="45" href="#45">45</a>  <em class="jxr_javadoccomment"> * check if there are any {@link TimerTask}s behind the schedule and execute</em>
<a class="jxr_linenumber" name="46" href="#46">46</a>  <em class="jxr_javadoccomment"> * them.</em>
<a class="jxr_linenumber" name="47" href="#47">47</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;</em>
<a class="jxr_linenumber" name="48" href="#48">48</a>  <em class="jxr_javadoccomment"> * You can increase or decrease the accuracy of the execution timing by</em>
<a class="jxr_linenumber" name="49" href="#49">49</a>  <em class="jxr_javadoccomment"> * specifying smaller or larger tick duration in the constructor.  In most</em>
<a class="jxr_linenumber" name="50" href="#50">50</a>  <em class="jxr_javadoccomment"> * network applications, I/O timeout does not need to be accurate.  Therefore,</em>
<a class="jxr_linenumber" name="51" href="#51">51</a>  <em class="jxr_javadoccomment"> * the default tick duration is 100 milliseconds and you will not need to try</em>
<a class="jxr_linenumber" name="52" href="#52">52</a>  <em class="jxr_javadoccomment"> * different configurations in most cases.</em>
<a class="jxr_linenumber" name="53" href="#53">53</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="54" href="#54">54</a>  <em class="jxr_javadoccomment"> * &lt;h3&gt;Ticks per Wheel (Wheel Size)&lt;/h3&gt;</em>
<a class="jxr_linenumber" name="55" href="#55">55</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="56" href="#56">56</a>  <em class="jxr_javadoccomment"> * {@link HashedWheelTimer} maintains a data structure called 'wheel'.</em>
<a class="jxr_linenumber" name="57" href="#57">57</a>  <em class="jxr_javadoccomment"> * To put simply, a wheel is a hash table of {@link TimerTask}s whose hash</em>
<a class="jxr_linenumber" name="58" href="#58">58</a>  <em class="jxr_javadoccomment"> * function is 'dead line of the task'.  The default number of ticks per wheel</em>
<a class="jxr_linenumber" name="59" href="#59">59</a>  <em class="jxr_javadoccomment"> * (i.e. the size of the wheel) is 512.  You could specify a larger value</em>
<a class="jxr_linenumber" name="60" href="#60">60</a>  <em class="jxr_javadoccomment"> * if you are going to schedule a lot of timeouts.</em>
<a class="jxr_linenumber" name="61" href="#61">61</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="62" href="#62">62</a>  <em class="jxr_javadoccomment"> * &lt;h3&gt;Do not create many instances.&lt;/h3&gt;</em>
<a class="jxr_linenumber" name="63" href="#63">63</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="64" href="#64">64</a>  <em class="jxr_javadoccomment"> * {@link HashedWheelTimer} creates a new thread whenever it is instantiated and</em>
<a class="jxr_linenumber" name="65" href="#65">65</a>  <em class="jxr_javadoccomment"> * started.  Therefore, you should make sure to create only one instance and</em>
<a class="jxr_linenumber" name="66" href="#66">66</a>  <em class="jxr_javadoccomment"> * share it across your application.  One of the common mistakes, that makes</em>
<a class="jxr_linenumber" name="67" href="#67">67</a>  <em class="jxr_javadoccomment"> * your application unresponsive, is to create a new instance in</em>
<a class="jxr_linenumber" name="68" href="#68">68</a>  <em class="jxr_javadoccomment"> * {@link ChannelPipelineFactory}, which results in the creation of a new thread</em>
<a class="jxr_linenumber" name="69" href="#69">69</a>  <em class="jxr_javadoccomment"> * for every connection.</em>
<a class="jxr_linenumber" name="70" href="#70">70</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="71" href="#71">71</a>  <em class="jxr_javadoccomment"> * &lt;h3&gt;Implementation Details&lt;/h3&gt;</em>
<a class="jxr_linenumber" name="72" href="#72">72</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="73" href="#73">73</a>  <em class="jxr_javadoccomment"> * {@link HashedWheelTimer} is based on</em>
<a class="jxr_linenumber" name="74" href="#74">74</a>  <em class="jxr_javadoccomment"> * &lt;a href="<a href="http://cseweb.ucsd.edu/users/varghese/" target="alexandria_uri">http://cseweb.ucsd.edu/users/varghese/</a>"&gt;George Varghese&lt;/a&gt; and</em>
<a class="jxr_linenumber" name="75" href="#75">75</a>  <em class="jxr_javadoccomment"> * Tony Lauck's paper,</em>
<a class="jxr_linenumber" name="76" href="#76">76</a>  <em class="jxr_javadoccomment"> * &lt;a href="<a href="http://cseweb.ucsd.edu/users/varghese/PAPERS/twheel.ps.Z" target="alexandria_uri">http://cseweb.ucsd.edu/users/varghese/PAPERS/twheel.ps.Z</a>"&gt;'Hashed</em>
<a class="jxr_linenumber" name="77" href="#77">77</a>  <em class="jxr_javadoccomment"> * and Hierarchical Timing Wheels: data structures to efficiently implement a</em>
<a class="jxr_linenumber" name="78" href="#78">78</a>  <em class="jxr_javadoccomment"> * timer facility'&lt;/a&gt;.  More comprehensive slides are located</em>
<a class="jxr_linenumber" name="79" href="#79">79</a>  <em class="jxr_javadoccomment"> * &lt;a href="<a href="http://www.cse.wustl.edu/~cdgill/courses/cs6874/TimingWheels.ppt" target="alexandria_uri">http://www.cse.wustl.edu/~cdgill/courses/cs6874/TimingWheels.ppt</a>"&gt;here&lt;/a&gt;.</em>
<a class="jxr_linenumber" name="80" href="#80">80</a>  <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="81" href="#81">81</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/jboss/netty/util/HashedWheelTimer.html">HashedWheelTimer</a> <strong class="jxr_keyword">implements</strong> <a href="../../../../org/jboss/netty/util/Timer.html">Timer</a> {
<a class="jxr_linenumber" name="82" href="#82">82</a>  
<a class="jxr_linenumber" name="83" href="#83">83</a>      <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/jboss/netty/logging/InternalLogger.html">InternalLogger</a> logger =
<a class="jxr_linenumber" name="84" href="#84">84</a>          InternalLoggerFactory.getInstance(HashedWheelTimer.<strong class="jxr_keyword">class</strong>);
<a class="jxr_linenumber" name="85" href="#85">85</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> AtomicInteger id = <strong class="jxr_keyword">new</strong> AtomicInteger();
<a class="jxr_linenumber" name="86" href="#86">86</a>  
<a class="jxr_linenumber" name="87" href="#87">87</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/jboss/netty/util/internal/SharedResourceMisuseDetector.html">SharedResourceMisuseDetector</a> misuseDetector =
<a class="jxr_linenumber" name="88" href="#88">88</a>          <strong class="jxr_keyword">new</strong> <a href="../../../../org/jboss/netty/util/internal/SharedResourceMisuseDetector.html">SharedResourceMisuseDetector</a>(HashedWheelTimer.<strong class="jxr_keyword">class</strong>);
<a class="jxr_linenumber" name="89" href="#89">89</a>  
<a class="jxr_linenumber" name="90" href="#90">90</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/jboss/netty/util/HashedWheelTimer.html">Worker</a> worker = <strong class="jxr_keyword">new</strong> <a href="../../../../org/jboss/netty/util/HashedWheelTimer.html">Worker</a>();
<a class="jxr_linenumber" name="91" href="#91">91</a>      <strong class="jxr_keyword">final</strong> Thread workerThread;
<a class="jxr_linenumber" name="92" href="#92">92</a>  
<a class="jxr_linenumber" name="93" href="#93">93</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> WORKER_STATE_INIT = 0;
<a class="jxr_linenumber" name="94" href="#94">94</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> WORKER_STATE_STARTED = 1;
<a class="jxr_linenumber" name="95" href="#95">95</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> WORKER_STATE_SHUTDOWN = 2;
<a class="jxr_linenumber" name="96" href="#96">96</a>      <strong class="jxr_keyword">final</strong> AtomicInteger workerState = <strong class="jxr_keyword">new</strong> AtomicInteger(); <em class="jxr_comment">// 0 - init, 1 - started, 2 - shut down</em>
<a class="jxr_linenumber" name="97" href="#97">97</a>  
<a class="jxr_linenumber" name="98" href="#98">98</a>      <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> tickDuration;
<a class="jxr_linenumber" name="99" href="#99">99</a>      <strong class="jxr_keyword">final</strong> Set&lt;HashedWheelTimeout&gt;[] wheel;
<a class="jxr_linenumber" name="100" href="#100">100</a>     <strong class="jxr_keyword">final</strong> ReusableIterator&lt;HashedWheelTimeout&gt;[] iterators;
<a class="jxr_linenumber" name="101" href="#101">101</a>     <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> mask;
<a class="jxr_linenumber" name="102" href="#102">102</a>     <strong class="jxr_keyword">final</strong> ReadWriteLock lock = <strong class="jxr_keyword">new</strong> ReentrantReadWriteLock();
<a class="jxr_linenumber" name="103" href="#103">103</a>     <strong class="jxr_keyword">volatile</strong> <strong class="jxr_keyword">int</strong> wheelCursor;
<a class="jxr_linenumber" name="104" href="#104">104</a> 
<a class="jxr_linenumber" name="105" href="#105">105</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="106" href="#106">106</a> <em class="jxr_javadoccomment">     * Creates a new timer with the default thread factory</em>
<a class="jxr_linenumber" name="107" href="#107">107</a> <em class="jxr_javadoccomment">     * ({@link Executors#defaultThreadFactory()}), default tick duration, and</em>
<a class="jxr_linenumber" name="108" href="#108">108</a> <em class="jxr_javadoccomment">     * default number of ticks per wheel.</em>
<a class="jxr_linenumber" name="109" href="#109">109</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="110" href="#110">110</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/jboss/netty/util/HashedWheelTimer.html">HashedWheelTimer</a>() {
<a class="jxr_linenumber" name="111" href="#111">111</a>         <strong class="jxr_keyword">this</strong>(Executors.defaultThreadFactory());
<a class="jxr_linenumber" name="112" href="#112">112</a>     }
<a class="jxr_linenumber" name="113" href="#113">113</a> 
<a class="jxr_linenumber" name="114" href="#114">114</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="115" href="#115">115</a> <em class="jxr_javadoccomment">     * Creates a new timer with the default thread factory</em>
<a class="jxr_linenumber" name="116" href="#116">116</a> <em class="jxr_javadoccomment">     * ({@link Executors#defaultThreadFactory()}) and default number of ticks</em>
<a class="jxr_linenumber" name="117" href="#117">117</a> <em class="jxr_javadoccomment">     * per wheel.</em>
<a class="jxr_linenumber" name="118" href="#118">118</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="119" href="#119">119</a> <em class="jxr_javadoccomment">     * @param tickDuration   the duration between tick</em>
<a class="jxr_linenumber" name="120" href="#120">120</a> <em class="jxr_javadoccomment">     * @param unit           the time unit of the {@code tickDuration}</em>
<a class="jxr_linenumber" name="121" href="#121">121</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="122" href="#122">122</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/jboss/netty/util/HashedWheelTimer.html">HashedWheelTimer</a>(<strong class="jxr_keyword">long</strong> tickDuration, TimeUnit unit) {
<a class="jxr_linenumber" name="123" href="#123">123</a>         <strong class="jxr_keyword">this</strong>(Executors.defaultThreadFactory(), tickDuration, unit);
<a class="jxr_linenumber" name="124" href="#124">124</a>     }
<a class="jxr_linenumber" name="125" href="#125">125</a> 
<a class="jxr_linenumber" name="126" href="#126">126</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="127" href="#127">127</a> <em class="jxr_javadoccomment">     * Creates a new timer with the default thread factory</em>
<a class="jxr_linenumber" name="128" href="#128">128</a> <em class="jxr_javadoccomment">     * ({@link Executors#defaultThreadFactory()}).</em>
<a class="jxr_linenumber" name="129" href="#129">129</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="130" href="#130">130</a> <em class="jxr_javadoccomment">     * @param tickDuration   the duration between tick</em>
<a class="jxr_linenumber" name="131" href="#131">131</a> <em class="jxr_javadoccomment">     * @param unit           the time unit of the {@code tickDuration}</em>
<a class="jxr_linenumber" name="132" href="#132">132</a> <em class="jxr_javadoccomment">     * @param ticksPerWheel  the size of the wheel</em>
<a class="jxr_linenumber" name="133" href="#133">133</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="134" href="#134">134</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/jboss/netty/util/HashedWheelTimer.html">HashedWheelTimer</a>(<strong class="jxr_keyword">long</strong> tickDuration, TimeUnit unit, <strong class="jxr_keyword">int</strong> ticksPerWheel) {
<a class="jxr_linenumber" name="135" href="#135">135</a>         <strong class="jxr_keyword">this</strong>(Executors.defaultThreadFactory(), tickDuration, unit, ticksPerWheel);
<a class="jxr_linenumber" name="136" href="#136">136</a>     }
<a class="jxr_linenumber" name="137" href="#137">137</a> 
<a class="jxr_linenumber" name="138" href="#138">138</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="139" href="#139">139</a> <em class="jxr_javadoccomment">     * Creates a new timer with the default tick duration and default number of</em>
<a class="jxr_linenumber" name="140" href="#140">140</a> <em class="jxr_javadoccomment">     * ticks per wheel.</em>
<a class="jxr_linenumber" name="141" href="#141">141</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="142" href="#142">142</a> <em class="jxr_javadoccomment">     * @param threadFactory  a {@link ThreadFactory} that creates a</em>
<a class="jxr_linenumber" name="143" href="#143">143</a> <em class="jxr_javadoccomment">     *                       background {@link Thread} which is dedicated to</em>
<a class="jxr_linenumber" name="144" href="#144">144</a> <em class="jxr_javadoccomment">     *                       {@link TimerTask} execution.</em>
<a class="jxr_linenumber" name="145" href="#145">145</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="146" href="#146">146</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/jboss/netty/util/HashedWheelTimer.html">HashedWheelTimer</a>(ThreadFactory threadFactory) {
<a class="jxr_linenumber" name="147" href="#147">147</a>         <strong class="jxr_keyword">this</strong>(threadFactory, 100, TimeUnit.MILLISECONDS);
<a class="jxr_linenumber" name="148" href="#148">148</a>     }
<a class="jxr_linenumber" name="149" href="#149">149</a> 
<a class="jxr_linenumber" name="150" href="#150">150</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="151" href="#151">151</a> <em class="jxr_javadoccomment">     * Creates a new timer with the default number of ticks per wheel.</em>
<a class="jxr_linenumber" name="152" href="#152">152</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="153" href="#153">153</a> <em class="jxr_javadoccomment">     * @param threadFactory  a {@link ThreadFactory} that creates a</em>
<a class="jxr_linenumber" name="154" href="#154">154</a> <em class="jxr_javadoccomment">     *                       background {@link Thread} which is dedicated to</em>
<a class="jxr_linenumber" name="155" href="#155">155</a> <em class="jxr_javadoccomment">     *                       {@link TimerTask} execution.</em>
<a class="jxr_linenumber" name="156" href="#156">156</a> <em class="jxr_javadoccomment">     * @param tickDuration   the duration between tick</em>
<a class="jxr_linenumber" name="157" href="#157">157</a> <em class="jxr_javadoccomment">     * @param unit           the time unit of the {@code tickDuration}</em>
<a class="jxr_linenumber" name="158" href="#158">158</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="159" href="#159">159</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/jboss/netty/util/HashedWheelTimer.html">HashedWheelTimer</a>(
<a class="jxr_linenumber" name="160" href="#160">160</a>             ThreadFactory threadFactory, <strong class="jxr_keyword">long</strong> tickDuration, TimeUnit unit) {
<a class="jxr_linenumber" name="161" href="#161">161</a>         <strong class="jxr_keyword">this</strong>(threadFactory, tickDuration, unit, 512);
<a class="jxr_linenumber" name="162" href="#162">162</a>     }
<a class="jxr_linenumber" name="163" href="#163">163</a> 
<a class="jxr_linenumber" name="164" href="#164">164</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="165" href="#165">165</a> <em class="jxr_javadoccomment">     * Creates a new timer.</em>
<a class="jxr_linenumber" name="166" href="#166">166</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="167" href="#167">167</a> <em class="jxr_javadoccomment">     * @param threadFactory  a {@link ThreadFactory} that creates a</em>
<a class="jxr_linenumber" name="168" href="#168">168</a> <em class="jxr_javadoccomment">     *                       background {@link Thread} which is dedicated to</em>
<a class="jxr_linenumber" name="169" href="#169">169</a> <em class="jxr_javadoccomment">     *                       {@link TimerTask} execution.</em>
<a class="jxr_linenumber" name="170" href="#170">170</a> <em class="jxr_javadoccomment">     * @param tickDuration   the duration between tick</em>
<a class="jxr_linenumber" name="171" href="#171">171</a> <em class="jxr_javadoccomment">     * @param unit           the time unit of the {@code tickDuration}</em>
<a class="jxr_linenumber" name="172" href="#172">172</a> <em class="jxr_javadoccomment">     * @param ticksPerWheel  the size of the wheel</em>
<a class="jxr_linenumber" name="173" href="#173">173</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="174" href="#174">174</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/jboss/netty/util/HashedWheelTimer.html">HashedWheelTimer</a>(
<a class="jxr_linenumber" name="175" href="#175">175</a>             ThreadFactory threadFactory,
<a class="jxr_linenumber" name="176" href="#176">176</a>             <strong class="jxr_keyword">long</strong> tickDuration, TimeUnit unit, <strong class="jxr_keyword">int</strong> ticksPerWheel) {
<a class="jxr_linenumber" name="177" href="#177">177</a>         <strong class="jxr_keyword">this</strong>(threadFactory, <strong class="jxr_keyword">null</strong>, tickDuration, unit, ticksPerWheel);
<a class="jxr_linenumber" name="178" href="#178">178</a>     }
<a class="jxr_linenumber" name="179" href="#179">179</a> 
<a class="jxr_linenumber" name="180" href="#180">180</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="181" href="#181">181</a> <em class="jxr_javadoccomment">     * Creates a new timer.</em>
<a class="jxr_linenumber" name="182" href="#182">182</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="183" href="#183">183</a> <em class="jxr_javadoccomment">     * @param threadFactory  a {@link ThreadFactory} that creates a</em>
<a class="jxr_linenumber" name="184" href="#184">184</a> <em class="jxr_javadoccomment">     *                       background {@link Thread} which is dedicated to</em>
<a class="jxr_linenumber" name="185" href="#185">185</a> <em class="jxr_javadoccomment">     *                       {@link TimerTask} execution.</em>
<a class="jxr_linenumber" name="186" href="#186">186</a> <em class="jxr_javadoccomment">     * @param determiner     thread name determiner to control thread name.</em>
<a class="jxr_linenumber" name="187" href="#187">187</a> <em class="jxr_javadoccomment">     * @param tickDuration   the duration between tick</em>
<a class="jxr_linenumber" name="188" href="#188">188</a> <em class="jxr_javadoccomment">     * @param unit           the time unit of the {@code tickDuration}</em>
<a class="jxr_linenumber" name="189" href="#189">189</a> <em class="jxr_javadoccomment">     * @param ticksPerWheel  the size of the wheel</em>
<a class="jxr_linenumber" name="190" href="#190">190</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="191" href="#191">191</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/jboss/netty/util/HashedWheelTimer.html">HashedWheelTimer</a>(
<a class="jxr_linenumber" name="192" href="#192">192</a>             ThreadFactory threadFactory,
<a class="jxr_linenumber" name="193" href="#193">193</a>             <a href="../../../../org/jboss/netty/util/ThreadNameDeterminer.html">ThreadNameDeterminer</a> determiner,
<a class="jxr_linenumber" name="194" href="#194">194</a>             <strong class="jxr_keyword">long</strong> tickDuration, TimeUnit unit, <strong class="jxr_keyword">int</strong> ticksPerWheel) {
<a class="jxr_linenumber" name="195" href="#195">195</a> 
<a class="jxr_linenumber" name="196" href="#196">196</a>         <strong class="jxr_keyword">if</strong> (threadFactory == <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="197" href="#197">197</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> NullPointerException(<span class="jxr_string">"threadFactory"</span>);
<a class="jxr_linenumber" name="198" href="#198">198</a>         }
<a class="jxr_linenumber" name="199" href="#199">199</a>         <strong class="jxr_keyword">if</strong> (unit == <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="200" href="#200">200</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> NullPointerException(<span class="jxr_string">"unit"</span>);
<a class="jxr_linenumber" name="201" href="#201">201</a>         }
<a class="jxr_linenumber" name="202" href="#202">202</a>         <strong class="jxr_keyword">if</strong> (tickDuration &lt;= 0) {
<a class="jxr_linenumber" name="203" href="#203">203</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(
<a class="jxr_linenumber" name="204" href="#204">204</a>                     <span class="jxr_string">"tickDuration must be greater than 0: "</span> + tickDuration);
<a class="jxr_linenumber" name="205" href="#205">205</a>         }
<a class="jxr_linenumber" name="206" href="#206">206</a>         <strong class="jxr_keyword">if</strong> (ticksPerWheel &lt;= 0) {
<a class="jxr_linenumber" name="207" href="#207">207</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(
<a class="jxr_linenumber" name="208" href="#208">208</a>                     <span class="jxr_string">"ticksPerWheel must be greater than 0: "</span> + ticksPerWheel);
<a class="jxr_linenumber" name="209" href="#209">209</a>         }
<a class="jxr_linenumber" name="210" href="#210">210</a> 
<a class="jxr_linenumber" name="211" href="#211">211</a>         <em class="jxr_comment">// Normalize ticksPerWheel to power of two and initialize the wheel.</em>
<a class="jxr_linenumber" name="212" href="#212">212</a>         wheel = createWheel(ticksPerWheel);
<a class="jxr_linenumber" name="213" href="#213">213</a>         iterators = createIterators(wheel);
<a class="jxr_linenumber" name="214" href="#214">214</a>         mask = wheel.length - 1;
<a class="jxr_linenumber" name="215" href="#215">215</a> 
<a class="jxr_linenumber" name="216" href="#216">216</a>         <em class="jxr_comment">// Convert tickDuration to nanos.</em>
<a class="jxr_linenumber" name="217" href="#217">217</a>         <strong class="jxr_keyword">this</strong>.tickDuration = tickDuration = unit.toNanos(tickDuration);
<a class="jxr_linenumber" name="218" href="#218">218</a> 
<a class="jxr_linenumber" name="219" href="#219">219</a>         <em class="jxr_comment">// Prevent overflow.</em>
<a class="jxr_linenumber" name="220" href="#220">220</a>         <strong class="jxr_keyword">if</strong> (tickDuration == Long.MAX_VALUE ||
<a class="jxr_linenumber" name="221" href="#221">221</a>                 tickDuration &gt;= Long.MAX_VALUE / wheel.length) {
<a class="jxr_linenumber" name="222" href="#222">222</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(
<a class="jxr_linenumber" name="223" href="#223">223</a>                     <span class="jxr_string">"tickDuration is too long: "</span> +
<a class="jxr_linenumber" name="224" href="#224">224</a>                     tickDuration +  ' ' + unit);
<a class="jxr_linenumber" name="225" href="#225">225</a>         }
<a class="jxr_linenumber" name="226" href="#226">226</a> 
<a class="jxr_linenumber" name="227" href="#227">227</a>         workerThread = threadFactory.newThread(<strong class="jxr_keyword">new</strong> <a href="../../../../org/jboss/netty/util/ThreadRenamingRunnable.html">ThreadRenamingRunnable</a>(
<a class="jxr_linenumber" name="228" href="#228">228</a>                         worker, <span class="jxr_string">"Hashed wheel timer #"</span> + id.incrementAndGet(),
<a class="jxr_linenumber" name="229" href="#229">229</a>                         determiner));
<a class="jxr_linenumber" name="230" href="#230">230</a> 
<a class="jxr_linenumber" name="231" href="#231">231</a>         <em class="jxr_comment">// Misuse check</em>
<a class="jxr_linenumber" name="232" href="#232">232</a>         misuseDetector.increase();
<a class="jxr_linenumber" name="233" href="#233">233</a>     }
<a class="jxr_linenumber" name="234" href="#234">234</a> 
<a class="jxr_linenumber" name="235" href="#235">235</a>     @SuppressWarnings(<span class="jxr_string">"unchecked"</span>)
<a class="jxr_linenumber" name="236" href="#236">236</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> Set&lt;HashedWheelTimeout&gt;[] createWheel(<strong class="jxr_keyword">int</strong> ticksPerWheel) {
<a class="jxr_linenumber" name="237" href="#237">237</a>         <strong class="jxr_keyword">if</strong> (ticksPerWheel &lt;= 0) {
<a class="jxr_linenumber" name="238" href="#238">238</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(
<a class="jxr_linenumber" name="239" href="#239">239</a>                     <span class="jxr_string">"ticksPerWheel must be greater than 0: "</span> + ticksPerWheel);
<a class="jxr_linenumber" name="240" href="#240">240</a>         }
<a class="jxr_linenumber" name="241" href="#241">241</a>         <strong class="jxr_keyword">if</strong> (ticksPerWheel &gt; 1073741824) {
<a class="jxr_linenumber" name="242" href="#242">242</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(
<a class="jxr_linenumber" name="243" href="#243">243</a>                     <span class="jxr_string">"ticksPerWheel may not be greater than 2^30: "</span> + ticksPerWheel);
<a class="jxr_linenumber" name="244" href="#244">244</a>         }
<a class="jxr_linenumber" name="245" href="#245">245</a> 
<a class="jxr_linenumber" name="246" href="#246">246</a>         ticksPerWheel = normalizeTicksPerWheel(ticksPerWheel);
<a class="jxr_linenumber" name="247" href="#247">247</a>         Set&lt;HashedWheelTimeout&gt;[] wheel = <strong class="jxr_keyword">new</strong> Set[ticksPerWheel];
<a class="jxr_linenumber" name="248" href="#248">248</a>         <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; wheel.length; i ++) {
<a class="jxr_linenumber" name="249" href="#249">249</a>             wheel[i] = <strong class="jxr_keyword">new</strong> MapBackedSet&lt;HashedWheelTimeout&gt;(
<a class="jxr_linenumber" name="250" href="#250">250</a>                     <strong class="jxr_keyword">new</strong> ConcurrentIdentityHashMap&lt;HashedWheelTimeout, Boolean&gt;(16, 0.95f, 4));
<a class="jxr_linenumber" name="251" href="#251">251</a>         }
<a class="jxr_linenumber" name="252" href="#252">252</a>         <strong class="jxr_keyword">return</strong> wheel;
<a class="jxr_linenumber" name="253" href="#253">253</a>     }
<a class="jxr_linenumber" name="254" href="#254">254</a> 
<a class="jxr_linenumber" name="255" href="#255">255</a>     @SuppressWarnings(<span class="jxr_string">"unchecked"</span>)
<a class="jxr_linenumber" name="256" href="#256">256</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> ReusableIterator&lt;HashedWheelTimeout&gt;[] createIterators(Set&lt;HashedWheelTimeout&gt;[] wheel) {
<a class="jxr_linenumber" name="257" href="#257">257</a>         ReusableIterator&lt;HashedWheelTimeout&gt;[] iterators = <strong class="jxr_keyword">new</strong> <a href="../../../../org/jboss/netty/util/internal/ReusableIterator.html">ReusableIterator</a>[wheel.length];
<a class="jxr_linenumber" name="258" href="#258">258</a>         <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; wheel.length; i ++) {
<a class="jxr_linenumber" name="259" href="#259">259</a>             iterators[i] = (ReusableIterator&lt;HashedWheelTimeout&gt;) wheel[i].iterator();
<a class="jxr_linenumber" name="260" href="#260">260</a>         }
<a class="jxr_linenumber" name="261" href="#261">261</a>         <strong class="jxr_keyword">return</strong> iterators;
<a class="jxr_linenumber" name="262" href="#262">262</a>     }
<a class="jxr_linenumber" name="263" href="#263">263</a> 
<a class="jxr_linenumber" name="264" href="#264">264</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> normalizeTicksPerWheel(<strong class="jxr_keyword">int</strong> ticksPerWheel) {
<a class="jxr_linenumber" name="265" href="#265">265</a>         <strong class="jxr_keyword">int</strong> normalizedTicksPerWheel = 1;
<a class="jxr_linenumber" name="266" href="#266">266</a>         <strong class="jxr_keyword">while</strong> (normalizedTicksPerWheel &lt; ticksPerWheel) {
<a class="jxr_linenumber" name="267" href="#267">267</a>             normalizedTicksPerWheel &lt;&lt;= 1;
<a class="jxr_linenumber" name="268" href="#268">268</a>         }
<a class="jxr_linenumber" name="269" href="#269">269</a>         <strong class="jxr_keyword">return</strong> normalizedTicksPerWheel;
<a class="jxr_linenumber" name="270" href="#270">270</a>     }
<a class="jxr_linenumber" name="271" href="#271">271</a> 
<a class="jxr_linenumber" name="272" href="#272">272</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="273" href="#273">273</a> <em class="jxr_javadoccomment">     * Starts the background thread explicitly.  The background thread will</em>
<a class="jxr_linenumber" name="274" href="#274">274</a> <em class="jxr_javadoccomment">     * start automatically on demand even if you did not call this method.</em>
<a class="jxr_linenumber" name="275" href="#275">275</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="276" href="#276">276</a> <em class="jxr_javadoccomment">     * @throws IllegalStateException if this timer has been</em>
<a class="jxr_linenumber" name="277" href="#277">277</a> <em class="jxr_javadoccomment">     *                               {@linkplain #stop() stopped} already</em>
<a class="jxr_linenumber" name="278" href="#278">278</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="279" href="#279">279</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> start() {
<a class="jxr_linenumber" name="280" href="#280">280</a>         <strong class="jxr_keyword">switch</strong> (workerState.get()) {
<a class="jxr_linenumber" name="281" href="#281">281</a>         <strong class="jxr_keyword">case</strong> WORKER_STATE_INIT:
<a class="jxr_linenumber" name="282" href="#282">282</a>             <strong class="jxr_keyword">if</strong> (workerState.compareAndSet(WORKER_STATE_INIT, WORKER_STATE_STARTED)) {
<a class="jxr_linenumber" name="283" href="#283">283</a>                 workerThread.start();
<a class="jxr_linenumber" name="284" href="#284">284</a>             }
<a class="jxr_linenumber" name="285" href="#285">285</a>             <strong class="jxr_keyword">break</strong>;
<a class="jxr_linenumber" name="286" href="#286">286</a>         <strong class="jxr_keyword">case</strong> WORKER_STATE_STARTED:
<a class="jxr_linenumber" name="287" href="#287">287</a>             <strong class="jxr_keyword">break</strong>;
<a class="jxr_linenumber" name="288" href="#288">288</a>         <strong class="jxr_keyword">case</strong> WORKER_STATE_SHUTDOWN:
<a class="jxr_linenumber" name="289" href="#289">289</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(<span class="jxr_string">"cannot be started once stopped"</span>);
<a class="jxr_linenumber" name="290" href="#290">290</a>         <strong class="jxr_keyword">default</strong>:
<a class="jxr_linenumber" name="291" href="#291">291</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> Error(<span class="jxr_string">"Invalid WorkerState"</span>);
<a class="jxr_linenumber" name="292" href="#292">292</a>         }
<a class="jxr_linenumber" name="293" href="#293">293</a>     }
<a class="jxr_linenumber" name="294" href="#294">294</a> 
<a class="jxr_linenumber" name="295" href="#295">295</a>     <strong class="jxr_keyword">public</strong> Set&lt;Timeout&gt; stop() {
<a class="jxr_linenumber" name="296" href="#296">296</a>         <strong class="jxr_keyword">if</strong> (Thread.currentThread() == workerThread) {
<a class="jxr_linenumber" name="297" href="#297">297</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(
<a class="jxr_linenumber" name="298" href="#298">298</a>                     HashedWheelTimer.<strong class="jxr_keyword">class</strong>.getSimpleName() +
<a class="jxr_linenumber" name="299" href="#299">299</a>                     <span class="jxr_string">".stop() cannot be called from "</span> +
<a class="jxr_linenumber" name="300" href="#300">300</a>                     TimerTask.<strong class="jxr_keyword">class</strong>.getSimpleName());
<a class="jxr_linenumber" name="301" href="#301">301</a>         }
<a class="jxr_linenumber" name="302" href="#302">302</a> 
<a class="jxr_linenumber" name="303" href="#303">303</a>         <strong class="jxr_keyword">if</strong> (!workerState.compareAndSet(WORKER_STATE_STARTED, WORKER_STATE_SHUTDOWN)) {
<a class="jxr_linenumber" name="304" href="#304">304</a>             <em class="jxr_comment">// workerState can be 0 or 2 at this moment - let it always be 2.</em>
<a class="jxr_linenumber" name="305" href="#305">305</a>             workerState.set(WORKER_STATE_SHUTDOWN);
<a class="jxr_linenumber" name="306" href="#306">306</a>             <strong class="jxr_keyword">return</strong> Collections.emptySet();
<a class="jxr_linenumber" name="307" href="#307">307</a>         }
<a class="jxr_linenumber" name="308" href="#308">308</a> 
<a class="jxr_linenumber" name="309" href="#309">309</a>         <strong class="jxr_keyword">boolean</strong> interrupted = false;
<a class="jxr_linenumber" name="310" href="#310">310</a>         <strong class="jxr_keyword">while</strong> (workerThread.isAlive()) {
<a class="jxr_linenumber" name="311" href="#311">311</a>             workerThread.interrupt();
<a class="jxr_linenumber" name="312" href="#312">312</a>             <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="313" href="#313">313</a>                 workerThread.join(100);
<a class="jxr_linenumber" name="314" href="#314">314</a>             } <strong class="jxr_keyword">catch</strong> (InterruptedException e) {
<a class="jxr_linenumber" name="315" href="#315">315</a>                 interrupted = <strong class="jxr_keyword">true</strong>;
<a class="jxr_linenumber" name="316" href="#316">316</a>             }
<a class="jxr_linenumber" name="317" href="#317">317</a>         }
<a class="jxr_linenumber" name="318" href="#318">318</a> 
<a class="jxr_linenumber" name="319" href="#319">319</a>         <strong class="jxr_keyword">if</strong> (interrupted) {
<a class="jxr_linenumber" name="320" href="#320">320</a>             Thread.currentThread().interrupt();
<a class="jxr_linenumber" name="321" href="#321">321</a>         }
<a class="jxr_linenumber" name="322" href="#322">322</a> 
<a class="jxr_linenumber" name="323" href="#323">323</a>         misuseDetector.decrease();
<a class="jxr_linenumber" name="324" href="#324">324</a> 
<a class="jxr_linenumber" name="325" href="#325">325</a>         Set&lt;Timeout&gt; unprocessedTimeouts = <strong class="jxr_keyword">new</strong> HashSet&lt;Timeout&gt;();
<a class="jxr_linenumber" name="326" href="#326">326</a>         <strong class="jxr_keyword">for</strong> (Set&lt;HashedWheelTimeout&gt; bucket: wheel) {
<a class="jxr_linenumber" name="327" href="#327">327</a>             unprocessedTimeouts.addAll(bucket);
<a class="jxr_linenumber" name="328" href="#328">328</a>             bucket.clear();
<a class="jxr_linenumber" name="329" href="#329">329</a>         }
<a class="jxr_linenumber" name="330" href="#330">330</a> 
<a class="jxr_linenumber" name="331" href="#331">331</a>         <strong class="jxr_keyword">return</strong> Collections.unmodifiableSet(unprocessedTimeouts);
<a class="jxr_linenumber" name="332" href="#332">332</a>     }
<a class="jxr_linenumber" name="333" href="#333">333</a> 
<a class="jxr_linenumber" name="334" href="#334">334</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/jboss/netty/util/Timeout.html">Timeout</a> newTimeout(<a href="../../../../org/jboss/netty/util/TimerTask.html">TimerTask</a> task, <strong class="jxr_keyword">long</strong> delay, TimeUnit unit) {
<a class="jxr_linenumber" name="335" href="#335">335</a>         <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> currentTime = System.nanoTime();
<a class="jxr_linenumber" name="336" href="#336">336</a> 
<a class="jxr_linenumber" name="337" href="#337">337</a>         <strong class="jxr_keyword">if</strong> (task == <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="338" href="#338">338</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> NullPointerException(<span class="jxr_string">"task"</span>);
<a class="jxr_linenumber" name="339" href="#339">339</a>         }
<a class="jxr_linenumber" name="340" href="#340">340</a>         <strong class="jxr_keyword">if</strong> (unit == <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="341" href="#341">341</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> NullPointerException(<span class="jxr_string">"unit"</span>);
<a class="jxr_linenumber" name="342" href="#342">342</a>         }
<a class="jxr_linenumber" name="343" href="#343">343</a> 
<a class="jxr_linenumber" name="344" href="#344">344</a>         start();
<a class="jxr_linenumber" name="345" href="#345">345</a> 
<a class="jxr_linenumber" name="346" href="#346">346</a>         <strong class="jxr_keyword">long</strong> delayInNanos = unit.toNanos(delay);
<a class="jxr_linenumber" name="347" href="#347">347</a>         <a href="../../../../org/jboss/netty/util/HashedWheelTimer.html">HashedWheelTimeout</a> timeout = <strong class="jxr_keyword">new</strong> <a href="../../../../org/jboss/netty/util/HashedWheelTimer.html">HashedWheelTimeout</a>(task, currentTime + delayInNanos);
<a class="jxr_linenumber" name="348" href="#348">348</a>         scheduleTimeout(timeout, delayInNanos);
<a class="jxr_linenumber" name="349" href="#349">349</a>         <strong class="jxr_keyword">return</strong> timeout;
<a class="jxr_linenumber" name="350" href="#350">350</a>     }
<a class="jxr_linenumber" name="351" href="#351">351</a> 
<a class="jxr_linenumber" name="352" href="#352">352</a>     <strong class="jxr_keyword">void</strong> scheduleTimeout(<a href="../../../../org/jboss/netty/util/HashedWheelTimer.html">HashedWheelTimeout</a> timeout, <strong class="jxr_keyword">long</strong> delay) {
<a class="jxr_linenumber" name="353" href="#353">353</a> 
<a class="jxr_linenumber" name="354" href="#354">354</a>         <em class="jxr_comment">// Prepare the required parameters to schedule the timeout object.</em>
<a class="jxr_linenumber" name="355" href="#355">355</a>         <strong class="jxr_keyword">long</strong> relativeIndex = (delay + tickDuration - 1) / tickDuration;
<a class="jxr_linenumber" name="356" href="#356">356</a> 
<a class="jxr_linenumber" name="357" href="#357">357</a>         <em class="jxr_comment">// if the previous line had an overflow going on, then we’ll just schedule this timeout</em>
<a class="jxr_linenumber" name="358" href="#358">358</a>         <em class="jxr_comment">// one tick early; that shouldn’t matter since we’re talking 270 years here</em>
<a class="jxr_linenumber" name="359" href="#359">359</a>         <strong class="jxr_keyword">if</strong> (relativeIndex &lt; 0) {
<a class="jxr_linenumber" name="360" href="#360">360</a>             relativeIndex = delay / tickDuration;
<a class="jxr_linenumber" name="361" href="#361">361</a>         }
<a class="jxr_linenumber" name="362" href="#362">362</a>         <strong class="jxr_keyword">if</strong> (relativeIndex == 0) {
<a class="jxr_linenumber" name="363" href="#363">363</a>             relativeIndex = 1;
<a class="jxr_linenumber" name="364" href="#364">364</a>         }
<a class="jxr_linenumber" name="365" href="#365">365</a>         <strong class="jxr_keyword">if</strong> ((relativeIndex &amp; mask) == 0) {
<a class="jxr_linenumber" name="366" href="#366">366</a>             relativeIndex--;
<a class="jxr_linenumber" name="367" href="#367">367</a>         }
<a class="jxr_linenumber" name="368" href="#368">368</a>         <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> remainingRounds = relativeIndex / wheel.length;
<a class="jxr_linenumber" name="369" href="#369">369</a> 
<a class="jxr_linenumber" name="370" href="#370">370</a>         <em class="jxr_comment">// Add the timeout to the wheel.</em>
<a class="jxr_linenumber" name="371" href="#371">371</a>         lock.readLock().lock();
<a class="jxr_linenumber" name="372" href="#372">372</a>         <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="373" href="#373">373</a>             <strong class="jxr_keyword">if</strong> (workerState.get() == WORKER_STATE_SHUTDOWN) {
<a class="jxr_linenumber" name="374" href="#374">374</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalStateException(<span class="jxr_string">"Cannot enqueue after shutdown"</span>);
<a class="jxr_linenumber" name="375" href="#375">375</a>             }
<a class="jxr_linenumber" name="376" href="#376">376</a>             <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> stopIndex = (<strong class="jxr_keyword">int</strong>) ((wheelCursor + relativeIndex) &amp; mask);
<a class="jxr_linenumber" name="377" href="#377">377</a>             timeout.stopIndex = stopIndex;
<a class="jxr_linenumber" name="378" href="#378">378</a>             timeout.remainingRounds = remainingRounds;
<a class="jxr_linenumber" name="379" href="#379">379</a> 
<a class="jxr_linenumber" name="380" href="#380">380</a>             wheel[stopIndex].add(timeout);
<a class="jxr_linenumber" name="381" href="#381">381</a>         } <strong class="jxr_keyword">finally</strong> {
<a class="jxr_linenumber" name="382" href="#382">382</a>             lock.readLock().unlock();
<a class="jxr_linenumber" name="383" href="#383">383</a>         }
<a class="jxr_linenumber" name="384" href="#384">384</a>     }
<a class="jxr_linenumber" name="385" href="#385">385</a> 
<a class="jxr_linenumber" name="386" href="#386">386</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/jboss/netty/util/HashedWheelTimer.html">Worker</a> <strong class="jxr_keyword">implements</strong> Runnable {
<a class="jxr_linenumber" name="387" href="#387">387</a> 
<a class="jxr_linenumber" name="388" href="#388">388</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">long</strong> startTime;
<a class="jxr_linenumber" name="389" href="#389">389</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">long</strong> tick;
<a class="jxr_linenumber" name="390" href="#390">390</a> 
<a class="jxr_linenumber" name="391" href="#391">391</a>         <a href="../../../../org/jboss/netty/util/HashedWheelTimer.html">Worker</a>() {
<a class="jxr_linenumber" name="392" href="#392">392</a>         }
<a class="jxr_linenumber" name="393" href="#393">393</a> 
<a class="jxr_linenumber" name="394" href="#394">394</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> run() {
<a class="jxr_linenumber" name="395" href="#395">395</a>             List&lt;HashedWheelTimeout&gt; expiredTimeouts =
<a class="jxr_linenumber" name="396" href="#396">396</a>                 <strong class="jxr_keyword">new</strong> ArrayList&lt;HashedWheelTimeout&gt;();
<a class="jxr_linenumber" name="397" href="#397">397</a> 
<a class="jxr_linenumber" name="398" href="#398">398</a>             startTime = System.nanoTime();
<a class="jxr_linenumber" name="399" href="#399">399</a>             tick = 1;
<a class="jxr_linenumber" name="400" href="#400">400</a> 
<a class="jxr_linenumber" name="401" href="#401">401</a>             <strong class="jxr_keyword">while</strong> (workerState.get() == WORKER_STATE_STARTED) {
<a class="jxr_linenumber" name="402" href="#402">402</a>                 <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> deadline = waitForNextTick();
<a class="jxr_linenumber" name="403" href="#403">403</a>                 <strong class="jxr_keyword">if</strong> (deadline &gt; 0) {
<a class="jxr_linenumber" name="404" href="#404">404</a>                     fetchExpiredTimeouts(expiredTimeouts, deadline);
<a class="jxr_linenumber" name="405" href="#405">405</a>                     notifyExpiredTimeouts(expiredTimeouts);
<a class="jxr_linenumber" name="406" href="#406">406</a>                 }
<a class="jxr_linenumber" name="407" href="#407">407</a>             }
<a class="jxr_linenumber" name="408" href="#408">408</a>         }
<a class="jxr_linenumber" name="409" href="#409">409</a> 
<a class="jxr_linenumber" name="410" href="#410">410</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> fetchExpiredTimeouts(
<a class="jxr_linenumber" name="411" href="#411">411</a>                 List&lt;HashedWheelTimeout&gt; expiredTimeouts, <strong class="jxr_keyword">long</strong> deadline) {
<a class="jxr_linenumber" name="412" href="#412">412</a> 
<a class="jxr_linenumber" name="413" href="#413">413</a>             <em class="jxr_comment">// Find the expired timeouts and decrease the round counter</em>
<a class="jxr_linenumber" name="414" href="#414">414</a>             <em class="jxr_comment">// if necessary.  Note that we don't send the notification</em>
<a class="jxr_linenumber" name="415" href="#415">415</a>             <em class="jxr_comment">// immediately to make sure the listeners are called without</em>
<a class="jxr_linenumber" name="416" href="#416">416</a>             <em class="jxr_comment">// an exclusive lock.</em>
<a class="jxr_linenumber" name="417" href="#417">417</a>             lock.writeLock().lock();
<a class="jxr_linenumber" name="418" href="#418">418</a>             <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="419" href="#419">419</a>                 <strong class="jxr_keyword">int</strong> newWheelCursor = wheelCursor = wheelCursor + 1 &amp; mask;
<a class="jxr_linenumber" name="420" href="#420">420</a>                 ReusableIterator&lt;HashedWheelTimeout&gt; i = iterators[newWheelCursor];
<a class="jxr_linenumber" name="421" href="#421">421</a>                 fetchExpiredTimeouts(expiredTimeouts, i, deadline);
<a class="jxr_linenumber" name="422" href="#422">422</a>             } <strong class="jxr_keyword">finally</strong> {
<a class="jxr_linenumber" name="423" href="#423">423</a>                 lock.writeLock().unlock();
<a class="jxr_linenumber" name="424" href="#424">424</a>             }
<a class="jxr_linenumber" name="425" href="#425">425</a>         }
<a class="jxr_linenumber" name="426" href="#426">426</a> 
<a class="jxr_linenumber" name="427" href="#427">427</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> fetchExpiredTimeouts(
<a class="jxr_linenumber" name="428" href="#428">428</a>                 List&lt;HashedWheelTimeout&gt; expiredTimeouts,
<a class="jxr_linenumber" name="429" href="#429">429</a>                 ReusableIterator&lt;HashedWheelTimeout&gt; i, <strong class="jxr_keyword">long</strong> deadline) {
<a class="jxr_linenumber" name="430" href="#430">430</a> 
<a class="jxr_linenumber" name="431" href="#431">431</a>             List&lt;HashedWheelTimeout&gt; slipped = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="432" href="#432">432</a>             i.rewind();
<a class="jxr_linenumber" name="433" href="#433">433</a>             <strong class="jxr_keyword">while</strong> (i.hasNext()) {
<a class="jxr_linenumber" name="434" href="#434">434</a>                 <a href="../../../../org/jboss/netty/util/HashedWheelTimer.html">HashedWheelTimeout</a> timeout = i.next();
<a class="jxr_linenumber" name="435" href="#435">435</a>                 <strong class="jxr_keyword">if</strong> (timeout.remainingRounds &lt;= 0) {
<a class="jxr_linenumber" name="436" href="#436">436</a>                     i.remove();
<a class="jxr_linenumber" name="437" href="#437">437</a>                     <strong class="jxr_keyword">if</strong> (timeout.deadline &lt;= deadline) {
<a class="jxr_linenumber" name="438" href="#438">438</a>                         expiredTimeouts.add(timeout);
<a class="jxr_linenumber" name="439" href="#439">439</a>                     } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="440" href="#440">440</a>                         <em class="jxr_comment">// Handle the case where the timeout is put into a wrong</em>
<a class="jxr_linenumber" name="441" href="#441">441</a>                         <em class="jxr_comment">// place, usually one tick earlier.  For now, just add</em>
<a class="jxr_linenumber" name="442" href="#442">442</a>                         <em class="jxr_comment">// it to a temporary list - we will reschedule it in a</em>
<a class="jxr_linenumber" name="443" href="#443">443</a>                         <em class="jxr_comment">// separate loop.</em>
<a class="jxr_linenumber" name="444" href="#444">444</a>                         <strong class="jxr_keyword">if</strong> (slipped == <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="445" href="#445">445</a>                             slipped = <strong class="jxr_keyword">new</strong> ArrayList&lt;HashedWheelTimeout&gt;();
<a class="jxr_linenumber" name="446" href="#446">446</a>                         }
<a class="jxr_linenumber" name="447" href="#447">447</a>                         slipped.add(timeout);
<a class="jxr_linenumber" name="448" href="#448">448</a>                     }
<a class="jxr_linenumber" name="449" href="#449">449</a>                 } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="450" href="#450">450</a>                     timeout.remainingRounds --;
<a class="jxr_linenumber" name="451" href="#451">451</a>                 }
<a class="jxr_linenumber" name="452" href="#452">452</a>             }
<a class="jxr_linenumber" name="453" href="#453">453</a> 
<a class="jxr_linenumber" name="454" href="#454">454</a>             <em class="jxr_comment">// Reschedule the slipped timeouts.</em>
<a class="jxr_linenumber" name="455" href="#455">455</a>             <strong class="jxr_keyword">if</strong> (slipped != <strong class="jxr_keyword">null</strong>) {
<a class="jxr_linenumber" name="456" href="#456">456</a>                 <strong class="jxr_keyword">for</strong> (HashedWheelTimeout timeout: slipped) {
<a class="jxr_linenumber" name="457" href="#457">457</a>                     scheduleTimeout(timeout, timeout.deadline - deadline);
<a class="jxr_linenumber" name="458" href="#458">458</a>                 }
<a class="jxr_linenumber" name="459" href="#459">459</a>             }
<a class="jxr_linenumber" name="460" href="#460">460</a>         }
<a class="jxr_linenumber" name="461" href="#461">461</a> 
<a class="jxr_linenumber" name="462" href="#462">462</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> notifyExpiredTimeouts(
<a class="jxr_linenumber" name="463" href="#463">463</a>                 List&lt;HashedWheelTimeout&gt; expiredTimeouts) {
<a class="jxr_linenumber" name="464" href="#464">464</a>             <em class="jxr_comment">// Notify the expired timeouts.</em>
<a class="jxr_linenumber" name="465" href="#465">465</a>             <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = expiredTimeouts.size() - 1; i &gt;= 0; i --) {
<a class="jxr_linenumber" name="466" href="#466">466</a>                 expiredTimeouts.get(i).expire();
<a class="jxr_linenumber" name="467" href="#467">467</a>             }
<a class="jxr_linenumber" name="468" href="#468">468</a> 
<a class="jxr_linenumber" name="469" href="#469">469</a>             <em class="jxr_comment">// Clean up the temporary list.</em>
<a class="jxr_linenumber" name="470" href="#470">470</a>             expiredTimeouts.clear();
<a class="jxr_linenumber" name="471" href="#471">471</a>         }
<a class="jxr_linenumber" name="472" href="#472">472</a> 
<a class="jxr_linenumber" name="473" href="#473">473</a>        <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="474" href="#474">474</a> <em class="jxr_javadoccomment">         * calculate goal nanoTime from startTime and current tick number,</em>
<a class="jxr_linenumber" name="475" href="#475">475</a> <em class="jxr_javadoccomment">         * then wait until that goal has been reached.</em>
<a class="jxr_linenumber" name="476" href="#476">476</a> <em class="jxr_javadoccomment">         * @return Long.MIN_VALUE if received a shutdown request,</em>
<a class="jxr_linenumber" name="477" href="#477">477</a> <em class="jxr_javadoccomment">         * current time otherwise (with Long.MIN_VALUE changed by +1)</em>
<a class="jxr_linenumber" name="478" href="#478">478</a> <em class="jxr_javadoccomment">         */</em>
<a class="jxr_linenumber" name="479" href="#479">479</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">long</strong> waitForNextTick() {
<a class="jxr_linenumber" name="480" href="#480">480</a>             <strong class="jxr_keyword">long</strong> deadline = startTime + tickDuration * tick;
<a class="jxr_linenumber" name="481" href="#481">481</a> 
<a class="jxr_linenumber" name="482" href="#482">482</a>             <strong class="jxr_keyword">for</strong> (;;) {
<a class="jxr_linenumber" name="483" href="#483">483</a>                 <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> currentTime = System.nanoTime();
<a class="jxr_linenumber" name="484" href="#484">484</a>                 <strong class="jxr_keyword">long</strong> sleepTimeMs = (deadline - currentTime + 999999) / 1000000;
<a class="jxr_linenumber" name="485" href="#485">485</a> 
<a class="jxr_linenumber" name="486" href="#486">486</a>                 <strong class="jxr_keyword">if</strong> (sleepTimeMs &lt;= 0) {
<a class="jxr_linenumber" name="487" href="#487">487</a>                     tick += 1;
<a class="jxr_linenumber" name="488" href="#488">488</a>                     <strong class="jxr_keyword">if</strong> (currentTime == Long.MIN_VALUE) {
<a class="jxr_linenumber" name="489" href="#489">489</a>                         <strong class="jxr_keyword">return</strong> -Long.MAX_VALUE;
<a class="jxr_linenumber" name="490" href="#490">490</a>                     } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="491" href="#491">491</a>                         <strong class="jxr_keyword">return</strong> currentTime;
<a class="jxr_linenumber" name="492" href="#492">492</a>                     }
<a class="jxr_linenumber" name="493" href="#493">493</a>                 }
<a class="jxr_linenumber" name="494" href="#494">494</a> 
<a class="jxr_linenumber" name="495" href="#495">495</a>                 <em class="jxr_comment">// Check if we run on windows, as if thats the case we will need</em>
<a class="jxr_linenumber" name="496" href="#496">496</a>                 <em class="jxr_comment">// to round the sleepTime as workaround for a bug that only affect</em>
<a class="jxr_linenumber" name="497" href="#497">497</a>                 <em class="jxr_comment">// the JVM if it runs on windows.</em>
<a class="jxr_linenumber" name="498" href="#498">498</a>                 <em class="jxr_comment">//</em>
<a class="jxr_linenumber" name="499" href="#499">499</a>                 <em class="jxr_comment">// See https://github.com/netty/netty/issues/356</em>
<a class="jxr_linenumber" name="500" href="#500">500</a>                 <strong class="jxr_keyword">if</strong> (DetectionUtil.isWindows()) {
<a class="jxr_linenumber" name="501" href="#501">501</a>                     sleepTimeMs = sleepTimeMs / 10 * 10;
<a class="jxr_linenumber" name="502" href="#502">502</a>                 }
<a class="jxr_linenumber" name="503" href="#503">503</a>                 <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="504" href="#504">504</a>                     Thread.sleep(sleepTimeMs);
<a class="jxr_linenumber" name="505" href="#505">505</a>                 } <strong class="jxr_keyword">catch</strong> (InterruptedException e) {
<a class="jxr_linenumber" name="506" href="#506">506</a>                     <strong class="jxr_keyword">if</strong> (workerState.get() == WORKER_STATE_SHUTDOWN) {
<a class="jxr_linenumber" name="507" href="#507">507</a>                         <strong class="jxr_keyword">return</strong> Long.MIN_VALUE;
<a class="jxr_linenumber" name="508" href="#508">508</a>                     }
<a class="jxr_linenumber" name="509" href="#509">509</a>                 }
<a class="jxr_linenumber" name="510" href="#510">510</a>             }
<a class="jxr_linenumber" name="511" href="#511">511</a>         }
<a class="jxr_linenumber" name="512" href="#512">512</a>     }
<a class="jxr_linenumber" name="513" href="#513">513</a> 
<a class="jxr_linenumber" name="514" href="#514">514</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/jboss/netty/util/HashedWheelTimer.html">HashedWheelTimeout</a> <strong class="jxr_keyword">implements</strong> <a href="../../../../org/jboss/netty/util/Timeout.html">Timeout</a> {
<a class="jxr_linenumber" name="515" href="#515">515</a> 
<a class="jxr_linenumber" name="516" href="#516">516</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> ST_INIT = 0;
<a class="jxr_linenumber" name="517" href="#517">517</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> ST_CANCELLED = 1;
<a class="jxr_linenumber" name="518" href="#518">518</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> ST_EXPIRED = 2;
<a class="jxr_linenumber" name="519" href="#519">519</a> 
<a class="jxr_linenumber" name="520" href="#520">520</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/jboss/netty/util/TimerTask.html">TimerTask</a> task;
<a class="jxr_linenumber" name="521" href="#521">521</a>         <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> deadline;
<a class="jxr_linenumber" name="522" href="#522">522</a>         <strong class="jxr_keyword">volatile</strong> <strong class="jxr_keyword">int</strong> stopIndex;
<a class="jxr_linenumber" name="523" href="#523">523</a>         <strong class="jxr_keyword">volatile</strong> <strong class="jxr_keyword">long</strong> remainingRounds;
<a class="jxr_linenumber" name="524" href="#524">524</a>         <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> AtomicInteger state = <strong class="jxr_keyword">new</strong> AtomicInteger(ST_INIT);
<a class="jxr_linenumber" name="525" href="#525">525</a> 
<a class="jxr_linenumber" name="526" href="#526">526</a>         <a href="../../../../org/jboss/netty/util/HashedWheelTimer.html">HashedWheelTimeout</a>(<a href="../../../../org/jboss/netty/util/TimerTask.html">TimerTask</a> task, <strong class="jxr_keyword">long</strong> deadline) {
<a class="jxr_linenumber" name="527" href="#527">527</a>             <strong class="jxr_keyword">this</strong>.task = task;
<a class="jxr_linenumber" name="528" href="#528">528</a>             <strong class="jxr_keyword">this</strong>.deadline = deadline;
<a class="jxr_linenumber" name="529" href="#529">529</a>         }
<a class="jxr_linenumber" name="530" href="#530">530</a> 
<a class="jxr_linenumber" name="531" href="#531">531</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../org/jboss/netty/util/Timer.html">Timer</a> getTimer() {
<a class="jxr_linenumber" name="532" href="#532">532</a>             <strong class="jxr_keyword">return</strong> HashedWheelTimer.<strong class="jxr_keyword">this</strong>;
<a class="jxr_linenumber" name="533" href="#533">533</a>         }
<a class="jxr_linenumber" name="534" href="#534">534</a> 
<a class="jxr_linenumber" name="535" href="#535">535</a>         <strong class="jxr_keyword">public</strong> <a href="../../../../org/jboss/netty/util/TimerTask.html">TimerTask</a> getTask() {
<a class="jxr_linenumber" name="536" href="#536">536</a>             <strong class="jxr_keyword">return</strong> task;
<a class="jxr_linenumber" name="537" href="#537">537</a>         }
<a class="jxr_linenumber" name="538" href="#538">538</a> 
<a class="jxr_linenumber" name="539" href="#539">539</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> cancel() {
<a class="jxr_linenumber" name="540" href="#540">540</a>             <strong class="jxr_keyword">if</strong> (!state.compareAndSet(ST_INIT, ST_CANCELLED)) {
<a class="jxr_linenumber" name="541" href="#541">541</a>                 <em class="jxr_comment">// TODO return false</em>
<a class="jxr_linenumber" name="542" href="#542">542</a>                 <strong class="jxr_keyword">return</strong>;
<a class="jxr_linenumber" name="543" href="#543">543</a>             }
<a class="jxr_linenumber" name="544" href="#544">544</a> 
<a class="jxr_linenumber" name="545" href="#545">545</a>             wheel[stopIndex].remove(<strong class="jxr_keyword">this</strong>);
<a class="jxr_linenumber" name="546" href="#546">546</a>         }
<a class="jxr_linenumber" name="547" href="#547">547</a> 
<a class="jxr_linenumber" name="548" href="#548">548</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> isCancelled() {
<a class="jxr_linenumber" name="549" href="#549">549</a>             <strong class="jxr_keyword">return</strong> state.get() == ST_CANCELLED;
<a class="jxr_linenumber" name="550" href="#550">550</a>         }
<a class="jxr_linenumber" name="551" href="#551">551</a> 
<a class="jxr_linenumber" name="552" href="#552">552</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> isExpired() {
<a class="jxr_linenumber" name="553" href="#553">553</a>             <strong class="jxr_keyword">return</strong> state.get() != ST_INIT;
<a class="jxr_linenumber" name="554" href="#554">554</a>         }
<a class="jxr_linenumber" name="555" href="#555">555</a> 
<a class="jxr_linenumber" name="556" href="#556">556</a>         <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> expire() {
<a class="jxr_linenumber" name="557" href="#557">557</a>             <strong class="jxr_keyword">if</strong> (!state.compareAndSet(ST_INIT, ST_EXPIRED)) {
<a class="jxr_linenumber" name="558" href="#558">558</a>                 <strong class="jxr_keyword">return</strong>;
<a class="jxr_linenumber" name="559" href="#559">559</a>             }
<a class="jxr_linenumber" name="560" href="#560">560</a> 
<a class="jxr_linenumber" name="561" href="#561">561</a>             <strong class="jxr_keyword">try</strong> {
<a class="jxr_linenumber" name="562" href="#562">562</a>                 task.run(<strong class="jxr_keyword">this</strong>);
<a class="jxr_linenumber" name="563" href="#563">563</a>             } <strong class="jxr_keyword">catch</strong> (Throwable t) {
<a class="jxr_linenumber" name="564" href="#564">564</a>                 <strong class="jxr_keyword">if</strong> (logger.isWarnEnabled()) {
<a class="jxr_linenumber" name="565" href="#565">565</a>                     logger.warn(
<a class="jxr_linenumber" name="566" href="#566">566</a>                             <span class="jxr_string">"An exception was thrown by "</span> +
<a class="jxr_linenumber" name="567" href="#567">567</a>                             TimerTask.<strong class="jxr_keyword">class</strong>.getSimpleName() + '.', t);
<a class="jxr_linenumber" name="568" href="#568">568</a>                 }
<a class="jxr_linenumber" name="569" href="#569">569</a>             }
<a class="jxr_linenumber" name="570" href="#570">570</a>         }
<a class="jxr_linenumber" name="571" href="#571">571</a> 
<a class="jxr_linenumber" name="572" href="#572">572</a>         @Override
<a class="jxr_linenumber" name="573" href="#573">573</a>         <strong class="jxr_keyword">public</strong> String toString() {
<a class="jxr_linenumber" name="574" href="#574">574</a>             <strong class="jxr_keyword">long</strong> currentTime = System.nanoTime();
<a class="jxr_linenumber" name="575" href="#575">575</a>             <strong class="jxr_keyword">long</strong> remaining = deadline - currentTime;
<a class="jxr_linenumber" name="576" href="#576">576</a> 
<a class="jxr_linenumber" name="577" href="#577">577</a>             StringBuilder buf = <strong class="jxr_keyword">new</strong> StringBuilder(192);
<a class="jxr_linenumber" name="578" href="#578">578</a>             buf.append(getClass().getSimpleName());
<a class="jxr_linenumber" name="579" href="#579">579</a>             buf.append('(');
<a class="jxr_linenumber" name="580" href="#580">580</a> 
<a class="jxr_linenumber" name="581" href="#581">581</a>             buf.append(<span class="jxr_string">"deadline: "</span>);
<a class="jxr_linenumber" name="582" href="#582">582</a>             <strong class="jxr_keyword">if</strong> (remaining &gt; 0) {
<a class="jxr_linenumber" name="583" href="#583">583</a>                 buf.append(remaining);
<a class="jxr_linenumber" name="584" href="#584">584</a>                 buf.append(<span class="jxr_string">" ms later, "</span>);
<a class="jxr_linenumber" name="585" href="#585">585</a>             } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (remaining &lt; 0) {
<a class="jxr_linenumber" name="586" href="#586">586</a>                 buf.append(-remaining);
<a class="jxr_linenumber" name="587" href="#587">587</a>                 buf.append(<span class="jxr_string">" ms ago, "</span>);
<a class="jxr_linenumber" name="588" href="#588">588</a>             } <strong class="jxr_keyword">else</strong> {
<a class="jxr_linenumber" name="589" href="#589">589</a>                 buf.append(<span class="jxr_string">"now, "</span>);
<a class="jxr_linenumber" name="590" href="#590">590</a>             }
<a class="jxr_linenumber" name="591" href="#591">591</a> 
<a class="jxr_linenumber" name="592" href="#592">592</a>             <strong class="jxr_keyword">if</strong> (isCancelled()) {
<a class="jxr_linenumber" name="593" href="#593">593</a>                 buf.append(<span class="jxr_string">", cancelled"</span>);
<a class="jxr_linenumber" name="594" href="#594">594</a>             }
<a class="jxr_linenumber" name="595" href="#595">595</a> 
<a class="jxr_linenumber" name="596" href="#596">596</a>             <strong class="jxr_keyword">return</strong> buf.append(')').toString();
<a class="jxr_linenumber" name="597" href="#597">597</a>         }
<a class="jxr_linenumber" name="598" href="#598">598</a>     }
<a class="jxr_linenumber" name="599" href="#599">599</a> }
</pre>
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